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Arrowhead Tunnels Project Surface Water Impact And ARROWHEAD TUNNELS PROJECT SURFACE WATER IMPACT AND RECOVERY ASSESSMENT Specialist Report October 2012 Neil Berg 1 TABLE OF CONTENTS EXECUTIVE SUMMARY 3 INTRODUCTION AND OBJECTIVES 5 FACTORS AFFECTING STREAM AND SPRING FLOWS IN THE ATP AREA 6 SURFACE WATER MONITORING HISTORY AND APPROACH 6 SURFACE WATER REGIMES 10 SURFACE WATER MITIGATION HISTORY 14 METHODOLOGY 14 APPROACHES TO IMPACT AND RECOVERY ASSESSMENT 16 SITES ASSESSED FOR POTENTIAL CONSTRUCTION IMPACT 20 RESULTS 21 IMPACTS TO TRIBAL LANDS 49 ENVIRONMENTAL EFFECTS TO SURFACE WATERS FROM ONGOING OPERATIONS AND MAINTENANCE OF THE ARROWHEAD TUNNELS PROJECT 49 LESSONS LEARNED 50 CONCLUSIONS 51 2 EXECUTIVE SUMMARY The Arrowhead tunnels are part of a larger, 48-mile water transmission facility (the Inland Feeder Project) incorporating pipelines and tunnels between Devil Canyon in the northwestern San Bernardino Mountains, and Diamond Valley Lake near Hemet, California. The objectives of the Inland Feeder Project are to provide a six-month water supply within the greater Los Angeles basin in case a catastrophic earthquake impairs the ability to move northern California water across the San Andreas fault zone into the Los Angeles basin. An additional objective of the Inland Feeder Project is to improve water quality compared to water from the Colorado River aqueduct. The two Arrowhead tunnels total approximately 9 miles in length stretching from City Creek on the south to Devil Canyon on the west on the lower slope of the San Bernardino Mountain Front Country. Tunnel construction can inadvertently ―leak‖ water from groundwater aquifers into the tunnel as the tunnel boring machines advance through the mountain. This groundwater would potentially have linked to the ground surface to provide source water to springs and streams. By removing groundwater tunnel construction can reduce surface flow or completely de-water streams and springs. This potential de-watering is a crux of Forest Service concern about the Arrowhead tunnel project. Objectives of this assessment are to identify (1) surface water assess impacts (if any) from construction of the tunnels and (2) identify the level of recovery in surface waters from any impacts. Approximately seventy-five locations in the Arrowhead project area were monitored for surface water flow, typically beginning in 1994, at intervals from weekly to twice annually. Measurements at almost all locations were made instantaneously, using either a current meter or by direct volumetric determination. At two locations in lower Sand Canyon automated gaging provided flow measurements at 10 or 15- minute intervals. These more detailed measurements proved critical in quantifying effects of summer evapotranspiration that caused flow changes up to 50 gallons per minute over 24-hour periods. Two related procedures were used to assess potential tunnel construction related impacts to surface waters. Both compare monitored flows at a reference (control) site with monitored flows at sites potentially impacted. The first procedure is an ocular comparison of flows through the entirety of the data record. A visual change in the flow relation between the two sites at or about the time of documented construction-induced impact at a proximate well(s) indicates a good likelihood for a construction-induced impact at the surface site. The second, more detailed, approach compares flows only for summer ―baseflow‖ periods when groundwater is the only source for surface water. A relationship is generated for the pre-impact/baseline period (determined by the date of impact at one or more nearby well(s)). A change from the baseline relationship indicates a high likelihood of a construction-induced impact to surface waters. Flows at eighteen monitoring locations (including sixteen on NFS lands) were reduced at one time or another as a consequence of tunnel construction. In addition, flows on the San Manuel reservation at the base of Sand Canyon were also reduced. Mitigation, as irrigation at selected locations above many of the impacted sites, was routinely applied for several years. The irrigation effectively compensated for much of the construction-caused reductions in natural flows. As of summer 2012, flows at sites 48, 53, and 636, all in upper Sand Canyon, sites 56, 58, and 181 in a tributary to City Creek, and sites 45 and 154 in Borea Canyon continued to be barely within or below the anticipated natural flow ranges. There are no anticipated environmental effects to surface waters in the project area anticipated with routine operation and maintenance of the Arrowhead Tunnels (i.e., the 2012 Special Use Permit). The 3 tunnels are steel-lined and consequently no groundwater should leak into the tunnels or otherwise be diverted from natural linkages to surface water sites. Because of potential residual surface water effects from tunnel construction it is anticipated that at most monitoring of recovery of stream and spring flows would be needed through 2013 at locations in Sand Canyon and City Creek tributary sites 56/181/58. Because no direct or indirect effects are anticipated there will be no cumulative effects stemming from tunnel operation and maintenance. 4 INTRODUCTION AND OBJECTIVES The Arrowhead Tunnel Project (ATP) comprises two 12 ft-diameter water supply tunnels totaling 9 miles in length under National Forest System lands in the San Bernardino National Forest. Tunnel construction started in 1998 and was completed in late 2009. Major potential environmental effects of the ATP include depletion of groundwater aquifers—as tunnel mining intercepts and removes groundwater from aquifers—and de-watering of springs and streams that have groundwater as their water source. Indirect effects include potential degradation of riparian and aquatic habitat for a variety of biological species, including federally-designated Threatened and Endangered and State or Forest-sensitive species. Per a variety of USDA Forest Service (FS) and other federal and state agency guidelines and directives, the San Bernardino National Forest needs to assess potential impacts and work to restore affected ecosystem components. Specifically, for instance, FS Interim Directive 2020 (Ecological Restoration and Resilience, 9/16/08) defines restoration as: ―… the process of assisting the recovery of resilience and adaptive capacity of ecosystems that have been degraded, damaged, or destroyed. Restoration focuses on establishing the composition, structure, pattern, and ecological processes necessary to make terrestrial and aquatic ecosystems sustainable, resilient, and healthy under current and future conditions.‖ This definition drives FS staff to ―… re-establish and retain resilience … to achieve sustainable management and provide a broad range of ecological services.‖ In this context identification of potential hydrological and biological effects is a first step in both the mitigation of current effects and the restoration of any effects continuing after the completion of a project. The focus of this report is surface resources, broadly interpreted to include riparian and aquatic-dependent biota and surface water flows themselves. The premise is that surface flows are a primary driver of the health of the aquatic and riparian biota and that potential impacts to biota are confined to areas where there are surface water impacts. More specifically, this report addresses spring and stream flows. Potential biological effects are addressed in separate documents. Although effects could be and probably are somewhat broadly spread in at least some project area catchments, the historical database for surface flow magnitudes is limited to between two and eleven surface water monitoring locations within each of six primary catchments (Figures 1a and 1b). Hence this impact assessment is effectively limited to a maximum of approximately seventy individual surface water monitoring locations. Three primary objectives are to (1) identify surface waters impacted by tunnel construction activities (status/presence-absence), (2) assess the confidence of the impact identification (e.g., firm or ―grey area‖), and (3) evaluate current impact trend (e.g., flows rebounding/recovered after impact or no evidence of rebound). This report does not address potential water quality effects because they have been assessed elsewhere (e.g., Berg 2008), including evaluation of potential effects of chemical leaching from mitigation water conveyance pipes, elevated chlorine concentrations in the mitigation water from the use of domestically-treated water, and elevated mitigation water temperatures due to water heating in the conveyance pipes. No water quality effects of significance were identified. This assessment incorporates information available through mid-2012. Another premise of this report is that tunnel construction can affect groundwater dynamics but not precipitation regimes. Therefore intermittent and particularly ephemeral surface water regimes that do not include summer flows are less important because they are relatively less influenced by groundwater. This distinction means that the focus of this assessment is on perennial streams which in the Mediterranean climate of the project area flow in summer due only to groundwater sources. 5 A primary aim of this assessment is to identify surface waters impacted by tunnel construction. ―Candidate impacted site‖ is the term that is used in this assessment to identify surface water monitoring sites that are potentially impacted by tunnel construction. FACTORS AFFECTING STREAM
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